It may be irrational but pi plays an important role in the everyday work of scientists at NASA.
What Is Pi ?
Pi is the ratio of a circle’s circumference to its diameter. It is also an irrational number, meaning its decimal representation never ends and it never repeats. Pi has been calculated to more than one trillion digits,
Why March 14?
March 14 marks the yearly celebration of the mathematical constant pi.
More than just a number for mathematicians, pi has all sorts of
applications in the real world, including on our missions. And as a holiday that encourages more
than a little creativity – whether it’s making pi-themed pies or
reciting from memory as many of the never-ending decimals of pi as
possible (the record is 70,030 digits).
While 3.14 is often a precise enough approximation,
hence the celebration occurring on March 14, or 3/14 (when written in standard U.S. month/day format), the first known celebration occurred in 1988, and in
2009, the U.S. House of Representatives passed a resolution designating
March 14 as Pi Day and encouraging teachers and students to celebrate
the day with activities that teach students about pi.
5 Ways We Use Pi at NASA
Below are some ways scientists and engineers used pi.
Keeping Spacecraft Chugging Along
Propulsion engineers use pi to determine the volume and surface area of propellant tanks. It’s how they size tanks and determine liquid propellant volume to keep spacecraft going and making new discoveries.
Getting New Perspectives on Saturn
A technique called pi transfer uses the gravity of Titan’s moon, Titan, to alter the orbit of the Cassini spacecraft so it can obtain different perspectives of the ringed planet.
Learning the Composition of Asteroids
Using pi and the asteroid’s mass, scientists can calculate the density of an asteroid and learn what it’s made of–ice, iron, rock, etc.
knowing the circumference, diameter and surface area of a crater can tell scientists a lot about the asteroid or meteor that may have carved it out.
Determining the Size of Exoplanets
Exoplanets are planets that orbit suns other than our own and scientists use pi to search for them. The first step is determining how much the light curve of a planet’s sun dims when a suspected planets passes in front of it.
Man hat den Schulabschluss geschafft und denkt: Jetzt bin ich erwachsen und es geht los in die große Welt und man sollte sich eigentlich mega gut fühlen. Aber irgendwie kommt dieser Moment einfach nicht.
Strange is our situation here on Earth. Each of us comes for a short visit, not knowing why, yet sometimes seeming to divine a purpose. From the standpoint of daily life, however, there is one thing we do know: that man is here for the sake of other men - above all for those upon whose smiles and well-being our own happiness depends.
The most beautiful thing we can experience is the mysterious. It is the source of all true art and science.
Happy 138th birthday to Albert Einstein, one of the brilliant fathers of modern physics and the founder of physical cosmology and relativity.